Revert to Published Version of Form

I have a Nintex form that I have published, and then changed and saved (not published) on the request of the client. They then came back to me and said they'd like to rethink again and to not do any more work and leave it as it is. So therefore I need to discard my saved version and just use revert to the Published version. Is there a way of reverting the form designer back to the currently published version rather than the saved version? I appreciate there is no version control, but if you can't do that, I'd be surprised.

This is for Office 365, versioning is not available like this. That's why I'm trying to find out if it's possible to ignore a saved version. The published version is obviously still there as it can be filled in, but there's no obvious way of getting the designer to open it rather than the more recently saved version.